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It is uncertain ________ side effect the medicine will bring about, although about two thousand patients have taken it.(2010·浙江)

A.that B.what C.how D.whether

 

B

【解析】B [考查主語從句引導詞。根據(jù)句意:盡管大約有兩千名病人服用過這種藥物,但是,它會帶來什么樣的副作用還不確定。side effect意思是“副作用”,還原主語從句中的主干是the medicine will bring about ________ side effect。故選擇what,形容詞“什么樣的”,起修飾作用。]

 

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